Quadrature_base.h

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#ifndef Quadrature_base_included
#define Quadrature_base_included
 
#include <TRUSTTabs_forward.h>
#include <Parser_U.h>
#include <Domaine_DG.h>
#include <Matrice_Morse_Sym.h>
 
class Quadrature_base
{
public:
  Quadrature_base(const Domaine_DG& dom) : dom_(dom),  nb_pts_integ_quad_(-1), nb_pts_integ_tri_(-1), nb_pts_integ_facets_(-1), nb_pts_integ_max_(-1)
  { }
 
  virtual ~Quadrature_base() {}
 
  inline const DoubleTab& get_integ_points() const { return integ_points_; }
  inline const DoubleTab& get_integ_points_facets() const { return integ_points_facets_; }
 
  inline const DoubleTab& get_weights() const { return weights_; }
  inline const DoubleTab& get_weights_facets() const { return weights_facets_; }
 
  inline const IntTab& get_tab_nb_pts_integ() const { return tab_nb_pts_integ_; }
  inline const IntTab& get_ind_pts_integ() const { return ind_pts_integ_; }
 
  /*! @brief Compute for the whole domain the exact location of integration points per element
   */
  virtual void compute_integ_points() = 0;
 
  /*! @brief Compute for the whole domain the exact location of integration points per facet
   */
  virtual void compute_integ_points_on_facet() = 0;
 
 
  inline int nb_pts_integ_max() const { return nb_pts_integ_max_; } // TODO: maximum number of quadrature points
  inline int nb_pts_integ(int e ) const { return tab_nb_pts_integ_(e); }
  inline int nb_pts_integ_facets() const { return nb_pts_integ_facets_; }
  inline int ind_pts_integ(int e ) const { return ind_pts_integ_(e); }
 
  /*! @brief Compute the integral of a function on the whole domain
   */
  double compute_integral(Parser_U& parser) const;
  /*! @brief Compute the integral of a function on the whole domain with its values on integration points
   */
  double compute_integral(DoubleTab& vals_pts_integ) const;
  /*! @brief Compute the integral of a function on one triangle
   * @param num_elem index of the element
   * @param parser parser providing the function values
   * @return the integral value on the element
   */
  double compute_integral_on_elem(int num_elem, Parser_U& parser) const ;
  /*! @brief Compute the integral of a function on each triangle
   * @param parser parser providing the function values
   * @return the total integral value over all elements
   */
  double compute_integral_on_elem(Parser_U& parser) const ;
 
  /*! @brief Compute the integral of a function on one triangle with its value on integration points
   * @param num_elem index of the element
   * @param val_pts_integ values of the function at integration points
   * @return the integral value on the element
   */
  double compute_integral_on_elem(int num_elem, DoubleTab& val_pts_integ) const ;
  /*! @brief Compute the integral of a function on each triangle with its value on integration points
   */
  // DoubleTab compute_integral_on_elem(DoubleTab& val_pts_integ) const ; // unsure this is used: commented out until removed
 
  /*! @brief Compute the integral of a function on one facet
   * @param num_facet index of the facet
   * @param parser parser providing the function values
   * @return the integral value on the facet
   */
  double compute_integral_on_facet(int num_facet, Parser_U& parser) const ;
  /*! @brief Compute the integral of a function on one facet with its value on integration points
   * @param num_facet index of the facet
   * @param val_pts_integ values of the function at integration points
   * @return the integral value on the facet
   */
  double compute_integral_on_facet(int num_facet, DoubleTab& val_pts_integ) const ;
 
 
protected:
  OBS_PTR(Domaine_DG) dom_;
 
  int nb_pts_integ_quad_; // local numbers of integ points for quadrangles
  int nb_pts_integ_tri_; // // local numbers of integ points for triangles
  int nb_pts_integ_facets_; // local numbers of integ points for facets
  int nb_pts_integ_max_; // maximal number of integ points for all geometrical types
 
  IntTab tab_nb_pts_integ_; // numbers of integ points cumulated
 
  IntTab ind_pts_integ_; // index of the first integration point for each element
 
  DoubleTab integ_points_; // Integ points for quadrature formula
  DoubleTab integ_points_facets_; // Integ points for quadrature formula for facets
  DoubleTab weights_;      //global weights
  DoubleTab weights_quad_; // local numbers
  DoubleTab weights_tri_; // local numbers
  DoubleTab weights_facets_; // local numbers
 
  // Computes the area of a triangle from vertex coordinates
  double triangleArea(double x1, double y1, double x2, double y2, double x3, double y3);
 
  // Computes a weight scale based on tessellation triangle and element volume
  double calculateWeightScale(const IntTab& vert_elems, const DoubleTab& xs, DoubleVect& volumes, int e, int s1, int s2, int s3);
  double calculateWeightScale(double ve, double s1x, double s1y, double s2x, double s2y, double s3x, double s3y);
 
};
 
#endif